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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2012 Zhenya Leonov<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.palamida.util.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.BufferedOutputStream;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.File;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.FileFilter;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.io.FileNotFoundException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.FileOutputStream;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.IOException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.OutputStream;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.PrintStream;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.io.PrintWriter;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.io.UnsupportedEncodingException;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.nio.charset.Charset;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.List;<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>import com.google.common.base.Charsets;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import com.google.common.collect.ImmutableSet;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import com.google.common.io.Closeables;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import com.google.common.io.Files;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * Static utility methods for working with {@link File}s.<a name="line.41"></a>
<span class="sourceLineNo">042</span> * <a name="line.42"></a>
<span class="sourceLineNo">043</span> * @see Files<a name="line.43"></a>
<span class="sourceLineNo">044</span> * @author Zhenya Leonov<a name="line.44"></a>
<span class="sourceLineNo">045</span> */<a name="line.45"></a>
<span class="sourceLineNo">046</span>final public class MoreFiles {<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>        private MoreFiles() {<a name="line.48"></a>
<span class="sourceLineNo">049</span>        }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>        /**<a name="line.51"></a>
<span class="sourceLineNo">052</span>         * Creates any necessary but nonexistent parent directories of the specified<a name="line.52"></a>
<span class="sourceLineNo">053</span>         * file. Note that if this operation fails it may have succeeded in creating<a name="line.53"></a>
<span class="sourceLineNo">054</span>         * some (but not all) of the necessary parent directories.<a name="line.54"></a>
<span class="sourceLineNo">055</span>         * &lt;p&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span>         * Unlike {@link Files#createParentDirs(File)} this methods returns the<a name="line.56"></a>
<span class="sourceLineNo">057</span>         * specified file.<a name="line.57"></a>
<span class="sourceLineNo">058</span>         * <a name="line.58"></a>
<span class="sourceLineNo">059</span>         * @param path<a name="line.59"></a>
<span class="sourceLineNo">060</span>         *            the specified file<a name="line.60"></a>
<span class="sourceLineNo">061</span>         * @return the specified file<a name="line.61"></a>
<span class="sourceLineNo">062</span>         * @throws IOException<a name="line.62"></a>
<span class="sourceLineNo">063</span>         */<a name="line.63"></a>
<span class="sourceLineNo">064</span>        public static File createParentDirs(final File path) throws IOException {<a name="line.64"></a>
<span class="sourceLineNo">065</span>                checkNotNull(path);<a name="line.65"></a>
<span class="sourceLineNo">066</span>                Files.createParentDirs(path);<a name="line.66"></a>
<span class="sourceLineNo">067</span>                return path;<a name="line.67"></a>
<span class="sourceLineNo">068</span>        }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>        /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>         * Returns a {@code File} object representing the canonical path of the<a name="line.71"></a>
<span class="sourceLineNo">072</span>         * current working directory.<a name="line.72"></a>
<span class="sourceLineNo">073</span>         * &lt;p&gt;<a name="line.73"></a>
<span class="sourceLineNo">074</span>         * For example the following code will simulate the Linux/Unix &lt;i&gt;pwd&lt;/i&gt;<a name="line.74"></a>
<span class="sourceLineNo">075</span>         * command: {@code System.out.println(IO.getCurrentDirectory());}<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * <a name="line.76"></a>
<span class="sourceLineNo">077</span>         * <a name="line.77"></a>
<span class="sourceLineNo">078</span>         * @return a {@code File} object representing the current working directory<a name="line.78"></a>
<span class="sourceLineNo">079</span>         * @throws IOException<a name="line.79"></a>
<span class="sourceLineNo">080</span>         *             if an I/O error occurs<a name="line.80"></a>
<span class="sourceLineNo">081</span>         */<a name="line.81"></a>
<span class="sourceLineNo">082</span>        public static File getWorkingDirectory() throws IOException {<a name="line.82"></a>
<span class="sourceLineNo">083</span>                return new File(".").getCanonicalFile();<a name="line.83"></a>
<span class="sourceLineNo">084</span>        }<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>        /**<a name="line.86"></a>
<span class="sourceLineNo">087</span>         * Returns a print writer to the given file using the specified charset.<a name="line.87"></a>
<span class="sourceLineNo">088</span>         * <a name="line.88"></a>
<span class="sourceLineNo">089</span>         * @param path<a name="line.89"></a>
<span class="sourceLineNo">090</span>         *            the given file<a name="line.90"></a>
<span class="sourceLineNo">091</span>         * @param charset<a name="line.91"></a>
<span class="sourceLineNo">092</span>         *            the character set to use when writing the file<a name="line.92"></a>
<span class="sourceLineNo">093</span>         * @param append<a name="line.93"></a>
<span class="sourceLineNo">094</span>         *            if {@code true}, then bytes will be written to the end of the<a name="line.94"></a>
<span class="sourceLineNo">095</span>         *            file rather than the beginning<a name="line.95"></a>
<span class="sourceLineNo">096</span>         * @param autoFlush<a name="line.96"></a>
<span class="sourceLineNo">097</span>         *            if {@code true}, the {@code println}, {@code printf}, and<a name="line.97"></a>
<span class="sourceLineNo">098</span>         *            {@code format} methods will flush the output buffer<a name="line.98"></a>
<span class="sourceLineNo">099</span>         * @throws IOException<a name="line.99"></a>
<span class="sourceLineNo">100</span>         *             if an I/O error occurs<a name="line.100"></a>
<span class="sourceLineNo">101</span>         * @return a print writer to the given file<a name="line.101"></a>
<span class="sourceLineNo">102</span>         * @see Charsets<a name="line.102"></a>
<span class="sourceLineNo">103</span>         */<a name="line.103"></a>
<span class="sourceLineNo">104</span>        public static PrintWriter newPrintWriter(final File path, final Charset charset, final boolean append,<a name="line.104"></a>
<span class="sourceLineNo">105</span>                        final boolean autoFlush) throws IOException {<a name="line.105"></a>
<span class="sourceLineNo">106</span>                checkNotNull(path);<a name="line.106"></a>
<span class="sourceLineNo">107</span>                checkNotNull(charset);<a name="line.107"></a>
<span class="sourceLineNo">108</span>                final OutputStream fos = new BufferedOutputStream(new FileOutputStream(path, append));<a name="line.108"></a>
<span class="sourceLineNo">109</span>                return new PrintWriter(fos, autoFlush);<a name="line.109"></a>
<span class="sourceLineNo">110</span>        }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>        /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>         * Returns a new {@code PrintStream} which writes to the given file using<a name="line.113"></a>
<span class="sourceLineNo">114</span>         * the specified charset.<a name="line.114"></a>
<span class="sourceLineNo">115</span>         * <a name="line.115"></a>
<span class="sourceLineNo">116</span>         * @param path<a name="line.116"></a>
<span class="sourceLineNo">117</span>         *            the specified file<a name="line.117"></a>
<span class="sourceLineNo">118</span>         * @param append<a name="line.118"></a>
<span class="sourceLineNo">119</span>         *            if {@code true}, then bytes will be written to the end of the<a name="line.119"></a>
<span class="sourceLineNo">120</span>         *            file rather than the beginning<a name="line.120"></a>
<span class="sourceLineNo">121</span>         * @param charset<a name="line.121"></a>
<span class="sourceLineNo">122</span>         *            the character set to use when writing to the file<a name="line.122"></a>
<span class="sourceLineNo">123</span>         * @param autoFlush<a name="line.123"></a>
<span class="sourceLineNo">124</span>         *            if {@code true}, the output buffer will be flushed whenever a<a name="line.124"></a>
<span class="sourceLineNo">125</span>         *            byte array is written, one of the println methods is invoked,<a name="line.125"></a>
<span class="sourceLineNo">126</span>         *            or a newline character or byte ('\n') is written<a name="line.126"></a>
<span class="sourceLineNo">127</span>         * @return new {@code PrintStream} which writes to the given file<a name="line.127"></a>
<span class="sourceLineNo">128</span>         * @throws FileNotFoundException<a name="line.128"></a>
<span class="sourceLineNo">129</span>         *             if an attempt to open the specified file fails<a name="line.129"></a>
<span class="sourceLineNo">130</span>         */<a name="line.130"></a>
<span class="sourceLineNo">131</span>        public static PrintStream newPrintStream(final File path, final Charset charset, final boolean append,<a name="line.131"></a>
<span class="sourceLineNo">132</span>                        final boolean autoFlush) throws FileNotFoundException {<a name="line.132"></a>
<span class="sourceLineNo">133</span>                checkNotNull(path);<a name="line.133"></a>
<span class="sourceLineNo">134</span>                checkNotNull(charset);<a name="line.134"></a>
<span class="sourceLineNo">135</span>                try {<a name="line.135"></a>
<span class="sourceLineNo">136</span>                        return new PrintStream(new BufferedOutputStream(new FileOutputStream(path, append)), autoFlush,<a name="line.136"></a>
<span class="sourceLineNo">137</span>                                        charset.toString());<a name="line.137"></a>
<span class="sourceLineNo">138</span>                } catch (UnsupportedEncodingException e) {<a name="line.138"></a>
<span class="sourceLineNo">139</span>                        throw new AssertionError(); // cannot happen<a name="line.139"></a>
<span class="sourceLineNo">140</span>                }<a name="line.140"></a>
<span class="sourceLineNo">141</span>        }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>        /**<a name="line.143"></a>
<span class="sourceLineNo">144</span>         * Writes a list of strings (separating them using line-termination<a name="line.144"></a>
<span class="sourceLineNo">145</span>         * characters) to the given file using the specified charset.<a name="line.145"></a>
<span class="sourceLineNo">146</span>         * <a name="line.146"></a>
<span class="sourceLineNo">147</span>         * @param path<a name="line.147"></a>
<span class="sourceLineNo">148</span>         *            the given file<a name="line.148"></a>
<span class="sourceLineNo">149</span>         * @param charset<a name="line.149"></a>
<span class="sourceLineNo">150</span>         *            the character set to use when writing the lines<a name="line.150"></a>
<span class="sourceLineNo">151</span>         * @param lines<a name="line.151"></a>
<span class="sourceLineNo">152</span>         *            an iterable of strings to be written to the file<a name="line.152"></a>
<span class="sourceLineNo">153</span>         * @return the given {@code File} object<a name="line.153"></a>
<span class="sourceLineNo">154</span>         * @throws IOException<a name="line.154"></a>
<span class="sourceLineNo">155</span>         *             if an I/O error occurs<a name="line.155"></a>
<span class="sourceLineNo">156</span>         * @see Charsets<a name="line.156"></a>
<span class="sourceLineNo">157</span>         */<a name="line.157"></a>
<span class="sourceLineNo">158</span>        public static File writeLines(final Iterable&lt;String&gt; lines, final File path, final Charset charset)<a name="line.158"></a>
<span class="sourceLineNo">159</span>                        throws IOException {<a name="line.159"></a>
<span class="sourceLineNo">160</span>                checkNotNull(path);<a name="line.160"></a>
<span class="sourceLineNo">161</span>                checkNotNull(charset);<a name="line.161"></a>
<span class="sourceLineNo">162</span>                checkNotNull(lines);<a name="line.162"></a>
<span class="sourceLineNo">163</span>                final PrintWriter writer = MoreFiles.newPrintWriter(path, charset, false, false);<a name="line.163"></a>
<span class="sourceLineNo">164</span>                for (final String line : lines)<a name="line.164"></a>
<span class="sourceLineNo">165</span>                        writer.println(line);<a name="line.165"></a>
<span class="sourceLineNo">166</span>                writer.close();<a name="line.166"></a>
<span class="sourceLineNo">167</span>                return path;<a name="line.167"></a>
<span class="sourceLineNo">168</span>        }<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span>        /**<a name="line.170"></a>
<span class="sourceLineNo">171</span>         * Returns the specified path string normalized to use the system separator<a name="line.171"></a>
<span class="sourceLineNo">172</span>         * as specified by {@link File#separator}.<a name="line.172"></a>
<span class="sourceLineNo">173</span>         * <a name="line.173"></a>
<span class="sourceLineNo">174</span>         * @param path<a name="line.174"></a>
<span class="sourceLineNo">175</span>         *            the specified path<a name="line.175"></a>
<span class="sourceLineNo">176</span>         * @return the specified path string normalized to use the system separator<a name="line.176"></a>
<span class="sourceLineNo">177</span>         *         as specified by {@link File#separator}<a name="line.177"></a>
<span class="sourceLineNo">178</span>         */<a name="line.178"></a>
<span class="sourceLineNo">179</span>        public static String separatorsToSystem(final String path) {<a name="line.179"></a>
<span class="sourceLineNo">180</span>                checkNotNull(path);<a name="line.180"></a>
<span class="sourceLineNo">181</span>                if (File.separator.equals("/"))<a name="line.181"></a>
<span class="sourceLineNo">182</span>                        return path.replace("\\", "/");<a name="line.182"></a>
<span class="sourceLineNo">183</span>                else<a name="line.183"></a>
<span class="sourceLineNo">184</span>                        return path.replace("/", "\\");<a name="line.184"></a>
<span class="sourceLineNo">185</span>        }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>        /**<a name="line.187"></a>
<span class="sourceLineNo">188</span>         * Returns all the files and sub-directories in the specified path.<a name="line.188"></a>
<span class="sourceLineNo">189</span>         * <a name="line.189"></a>
<span class="sourceLineNo">190</span>         * @param path<a name="line.190"></a>
<span class="sourceLineNo">191</span>         *            the specified path<a name="line.191"></a>
<span class="sourceLineNo">192</span>         * @return all the files and sub-directories in the specified path<a name="line.192"></a>
<span class="sourceLineNo">193</span>         * @throws IOException<a name="line.193"></a>
<span class="sourceLineNo">194</span>         *             if an I/O error occurs<a name="line.194"></a>
<span class="sourceLineNo">195</span>         */<a name="line.195"></a>
<span class="sourceLineNo">196</span>        public static Iterable&lt;File&gt; walkFileTree(final File path) throws IOException {<a name="line.196"></a>
<span class="sourceLineNo">197</span>                checkNotNull(path);<a name="line.197"></a>
<span class="sourceLineNo">198</span>                checkArgument(path.isDirectory());<a name="line.198"></a>
<span class="sourceLineNo">199</span>                return walkFileTree(path, FileFilters.TRUE);<a name="line.199"></a>
<span class="sourceLineNo">200</span>        }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span>        /**<a name="line.202"></a>
<span class="sourceLineNo">203</span>         * Returns all the files and sub-directories in the specified path which<a name="line.203"></a>
<span class="sourceLineNo">204</span>         * satisfy the given filter.<a name="line.204"></a>
<span class="sourceLineNo">205</span>         * <a name="line.205"></a>
<span class="sourceLineNo">206</span>         * @param path<a name="line.206"></a>
<span class="sourceLineNo">207</span>         *            the specified path<a name="line.207"></a>
<span class="sourceLineNo">208</span>         * @param filter<a name="line.208"></a>
<span class="sourceLineNo">209</span>         *            a file filter<a name="line.209"></a>
<span class="sourceLineNo">210</span>         * @return all the files and sub-directories in the specified path which<a name="line.210"></a>
<span class="sourceLineNo">211</span>         *         satisfy the given filter<a name="line.211"></a>
<span class="sourceLineNo">212</span>         * @throws IOException<a name="line.212"></a>
<span class="sourceLineNo">213</span>         *             if an I/O error occurs<a name="line.213"></a>
<span class="sourceLineNo">214</span>         */<a name="line.214"></a>
<span class="sourceLineNo">215</span>        public static Iterable&lt;File&gt; walkFileTree(final File path, final FileFilter filter) throws IOException {<a name="line.215"></a>
<span class="sourceLineNo">216</span>                checkNotNull(path);<a name="line.216"></a>
<span class="sourceLineNo">217</span>                checkNotNull(filter);<a name="line.217"></a>
<span class="sourceLineNo">218</span>                checkArgument(path.isDirectory());<a name="line.218"></a>
<span class="sourceLineNo">219</span>                final ImmutableSet.Builder&lt;File&gt; builder = ImmutableSet.builder();<a name="line.219"></a>
<span class="sourceLineNo">220</span>                walkFileTree(builder, path, filter, FileProcessors.alwaysTrue());<a name="line.220"></a>
<span class="sourceLineNo">221</span>                return builder.build();<a name="line.221"></a>
<span class="sourceLineNo">222</span>        }<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>        /**<a name="line.224"></a>
<span class="sourceLineNo">225</span>         * Processes all the files and sub-directories in the specified path which<a name="line.225"></a>
<span class="sourceLineNo">226</span>         * satisfy the given filter.<a name="line.226"></a>
<span class="sourceLineNo">227</span>         * <a name="line.227"></a>
<span class="sourceLineNo">228</span>         * @param path<a name="line.228"></a>
<span class="sourceLineNo">229</span>         *            the specified directory<a name="line.229"></a>
<span class="sourceLineNo">230</span>         * @param filter<a name="line.230"></a>
<span class="sourceLineNo">231</span>         *            a file filter<a name="line.231"></a>
<span class="sourceLineNo">232</span>         * @param processor<a name="line.232"></a>
<span class="sourceLineNo">233</span>         *            the {@code FileProcessor} instance used to process the files<a name="line.233"></a>
<span class="sourceLineNo">234</span>         * @throws IOException<a name="line.234"></a>
<span class="sourceLineNo">235</span>         *             if an I/O error occurs<a name="line.235"></a>
<span class="sourceLineNo">236</span>         */<a name="line.236"></a>
<span class="sourceLineNo">237</span>        public static void walkFileTree(final File path, final FileFilter filter, final FileProcessor&lt;?&gt; processor)<a name="line.237"></a>
<span class="sourceLineNo">238</span>                        throws IOException {<a name="line.238"></a>
<span class="sourceLineNo">239</span>                checkNotNull(path);<a name="line.239"></a>
<span class="sourceLineNo">240</span>                checkNotNull(filter);<a name="line.240"></a>
<span class="sourceLineNo">241</span>                checkNotNull(processor);<a name="line.241"></a>
<span class="sourceLineNo">242</span>                checkArgument(path.exists());<a name="line.242"></a>
<span class="sourceLineNo">243</span>                walkFileTree(null, path, filter, processor);<a name="line.243"></a>
<span class="sourceLineNo">244</span>        }<a name="line.244"></a>
<span class="sourceLineNo">245</span><a name="line.245"></a>
<span class="sourceLineNo">246</span>        /**<a name="line.246"></a>
<span class="sourceLineNo">247</span>         * Processes all the files and sub-directories in the specified path.<a name="line.247"></a>
<span class="sourceLineNo">248</span>         * <a name="line.248"></a>
<span class="sourceLineNo">249</span>         * @param path<a name="line.249"></a>
<span class="sourceLineNo">250</span>         *            the specified path<a name="line.250"></a>
<span class="sourceLineNo">251</span>         * @param processor<a name="line.251"></a>
<span class="sourceLineNo">252</span>         *            the {@code FileProcessor} instance used to process the files<a name="line.252"></a>
<span class="sourceLineNo">253</span>         * @throws IOException<a name="line.253"></a>
<span class="sourceLineNo">254</span>         *             if an I/O error occurs<a name="line.254"></a>
<span class="sourceLineNo">255</span>         */<a name="line.255"></a>
<span class="sourceLineNo">256</span>        public static void walkFileTree(final File path, final FileProcessor&lt;?&gt; processor) throws IOException {<a name="line.256"></a>
<span class="sourceLineNo">257</span>                checkNotNull(path);<a name="line.257"></a>
<span class="sourceLineNo">258</span>                checkNotNull(processor);<a name="line.258"></a>
<span class="sourceLineNo">259</span>                checkArgument(path.isDirectory());<a name="line.259"></a>
<span class="sourceLineNo">260</span>                walkFileTree(null, path, FileFilters.TRUE, processor);<a name="line.260"></a>
<span class="sourceLineNo">261</span>        }<a name="line.261"></a>
<span class="sourceLineNo">262</span><a name="line.262"></a>
<span class="sourceLineNo">263</span>        private static void walkFileTree(final ImmutableSet.Builder&lt;File&gt; builder, final File path,<a name="line.263"></a>
<span class="sourceLineNo">264</span>                        final FileFilter filter, final FileProcessor&lt;?&gt; processor) throws IOException {<a name="line.264"></a>
<span class="sourceLineNo">265</span>                final File[] files = path.listFiles(FileFilters.or(FileFilters.DIRECTORY, filter));<a name="line.265"></a>
<span class="sourceLineNo">266</span>                if (files != null)<a name="line.266"></a>
<span class="sourceLineNo">267</span>                        for (final File file : files) {<a name="line.267"></a>
<span class="sourceLineNo">268</span>                                if (filter.accept(file)) {<a name="line.268"></a>
<span class="sourceLineNo">269</span>                                        if (builder != null)<a name="line.269"></a>
<span class="sourceLineNo">270</span>                                                builder.add(file);<a name="line.270"></a>
<span class="sourceLineNo">271</span>                                        if (!processor.processFile(file))<a name="line.271"></a>
<span class="sourceLineNo">272</span>                                                return;<a name="line.272"></a>
<span class="sourceLineNo">273</span>                                }<a name="line.273"></a>
<span class="sourceLineNo">274</span>                                if (file.isDirectory())<a name="line.274"></a>
<span class="sourceLineNo">275</span>                                        walkFileTree(builder, file, filter, processor);<a name="line.275"></a>
<span class="sourceLineNo">276</span>                        }<a name="line.276"></a>
<span class="sourceLineNo">277</span>                else if (filter.accept(path)) {<a name="line.277"></a>
<span class="sourceLineNo">278</span>                        if (builder != null)<a name="line.278"></a>
<span class="sourceLineNo">279</span>                                builder.add(path);<a name="line.279"></a>
<span class="sourceLineNo">280</span>                        if (!processor.processFile(path))<a name="line.280"></a>
<span class="sourceLineNo">281</span>                                return;<a name="line.281"></a>
<span class="sourceLineNo">282</span>                }<a name="line.282"></a>
<span class="sourceLineNo">283</span>        }<a name="line.283"></a>
<span class="sourceLineNo">284</span><a name="line.284"></a>
<span class="sourceLineNo">285</span>        /**<a name="line.285"></a>
<span class="sourceLineNo">286</span>         * Appends a list of strings (separating them using line-termination<a name="line.286"></a>
<span class="sourceLineNo">287</span>         * characters) to the given file using the specified charset.<a name="line.287"></a>
<span class="sourceLineNo">288</span>         * <a name="line.288"></a>
<span class="sourceLineNo">289</span>         * @param lines<a name="line.289"></a>
<span class="sourceLineNo">290</span>         *            the character sequence to append<a name="line.290"></a>
<span class="sourceLineNo">291</span>         * @param to<a name="line.291"></a>
<span class="sourceLineNo">292</span>         *            the given file<a name="line.292"></a>
<span class="sourceLineNo">293</span>         * @param charset<a name="line.293"></a>
<span class="sourceLineNo">294</span>         *            the character set to use when wOriting the lines<a name="line.294"></a>
<span class="sourceLineNo">295</span>         * @return the given file<a name="line.295"></a>
<span class="sourceLineNo">296</span>         * @throws IOException<a name="line.296"></a>
<span class="sourceLineNo">297</span>         *             if an I/O error occurs<a name="line.297"></a>
<span class="sourceLineNo">298</span>         */<a name="line.298"></a>
<span class="sourceLineNo">299</span>        public static File appendLines(final List&lt;String&gt; lines, final File to, final Charset charset) throws IOException {<a name="line.299"></a>
<span class="sourceLineNo">300</span>                checkNotNull(lines);<a name="line.300"></a>
<span class="sourceLineNo">301</span>                checkNotNull(to);<a name="line.301"></a>
<span class="sourceLineNo">302</span>                checkNotNull(charset);<a name="line.302"></a>
<span class="sourceLineNo">303</span>                final PrintWriter writer = newPrintWriter(to, charset, true, false);<a name="line.303"></a>
<span class="sourceLineNo">304</span>                for (final String line : lines)<a name="line.304"></a>
<span class="sourceLineNo">305</span>                        writer.println(line);<a name="line.305"></a>
<span class="sourceLineNo">306</span>                Closeables.close(writer, false);<a name="line.306"></a>
<span class="sourceLineNo">307</span>                return to;<a name="line.307"></a>
<span class="sourceLineNo">308</span>        }<a name="line.308"></a>
<span class="sourceLineNo">309</span><a name="line.309"></a>
<span class="sourceLineNo">310</span>}<a name="line.310"></a>




























































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